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"Connection reset by peer" suggest that something is blocking your request.
This could be firewall on your PRTG server, firewall/switch on your network, mail servers firewall or the mail server itself.

1) Try to increase the scanning interval and timeout values of the IMAP sensor
2) Try if IMAP works from your PRTG server with a email client, i.e. Thunderbird

Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.